公开(公告)号：US09484758B2

公开(公告)日：2016-11-01

申请号：US13801817

申请日：2013-03-13

Applicant: Apple Inc.

Inventor： Bin Chen ,  Mao Ye ,  Yongxuan Hu

IPC: H02M3/04 ,  H02M3/335 ,  G05F1/00 ,  H02J7/00 ,  H02M3/158 ,  G05F3/08 ,  H02M3/28 ,  H02M1/00

CPC classification number: H02J7/0052 ,  G05F3/08 ,  H02J7/0065 ,  H02M3/1582 ,  H02M3/1588 ,  H02M3/285 ,  H02M2001/0006 ,  H02M2001/0032 ,  H03K2217/0063 ,  H03K2217/0081 ,  Y02B40/90 ,  Y02B70/1466 ,  Y02B70/16 ,  Y02T90/127

Abstract: The disclosed embodiments provide a synchronous switching converter that converts a DC input voltage into a DC output voltage. This synchronous switching converter includes a high-side switching MOSFET coupled between an input node and a first node. The converter also includes a low-side switching MOSFET coupled between the first node and a ground node and is in series with the high-side switching MOSFET. This converter additionally includes a bootstrap capacitor coupled to the high-side switching MOSFET to provide turn-on voltage for the high-side switching MOSFET. Furthermore, the converter includes a main refresh circuit coupled to the bootstrap capacitor and is configured to refresh the bootstrap capacitor during a first operating mode of the synchronous switching converter. Moreover, the converter includes an auxiliary refresh circuit coupled to the main refresh circuit and the bootstrap capacitor and is configured to refresh the bootstrap capacitor during a second operating mode of the converter.

Abstract translation: 所公开的实施例提供将DC输入电压转换为DC输出电压的同步开关转换器。 该同步开关转换器包括耦合在输入节点和第一节点之间的高侧开关MOSFET。 该转换器还包括耦合在第一节点和接地节点之间并与高侧开关MOSFET串联的低侧开关MOSFET。 该转换器还包括耦合到高侧开关MOSFET的自举电容器，以为高侧开关MOSFET提供导通电压。 此外，转换器包括耦合到自举电容器的主刷新电路，并且被配置为在同步开关转换器的第一操作模式期间刷新自举电容器。 此外，转换器包括耦合到主刷新电路和自举电容器的辅助刷新电路，并且被配置为在转换器的第二操作模式期间刷新自举电容器。

公开(公告)号：US20140217959A1

公开(公告)日：2014-08-07

申请号：US13801817

申请日：2013-03-13

Applicant: APPLE INC.

Inventor： Bin Chen ,  Mao Ye ,  Yongxuan Hu

IPC: G05F3/08 ,  H02J7/00

CPC classification number: H02J7/0052 ,  G05F3/08 ,  H02J7/0065 ,  H02M3/1582 ,  H02M3/1588 ,  H02M3/285 ,  H02M2001/0006 ,  H02M2001/0032 ,  H03K2217/0063 ,  H03K2217/0081 ,  Y02B40/90 ,  Y02B70/1466 ,  Y02B70/16 ,  Y02T90/127

Abstract: The disclosed embodiments provide a synchronous switching converter that converts a DC input voltage into a DC output voltage. This synchronous switching converter includes a high-side switching MOSFET coupled between an input node and a first node. The converter also includes a low-side switching MOSFET coupled between the first node and a ground node and is in series with the high-side switching MOSFET. This converter additionally includes a bootstrap capacitor coupled to the high-side switching MOSFET to provide turn-on voltage for the high-side switching MOSFET. Furthermore, the converter includes a main refresh circuit coupled to the bootstrap capacitor and is configured to refresh the bootstrap capacitor during a first operating mode of the synchronous switching converter. Moreover, the converter includes an auxiliary refresh circuit coupled to the main refresh circuit and the bootstrap capacitor and is configured to refresh the bootstrap capacitor during a second operating mode of the converter.

Abstract translation: 所公开的实施例提供将DC输入电压转换为DC输出电压的同步开关转换器。 该同步开关转换器包括耦合在输入节点和第一节点之间的高侧开关MOSFET。 该转换器还包括耦合在第一节点和接地节点之间并与高侧开关MOSFET串联的低侧开关MOSFET。 该转换器还包括耦合到高侧开关MOSFET的自举电容器，以为高侧开关MOSFET提供导通电压。 此外，转换器包括耦合到自举电容器的主刷新电路，并且被配置为在同步开关转换器的第一操作模式期间刷新自举电容器。 此外，转换器包括耦合到主刷新电路和自举电容器的辅助刷新电路，并且被配置为在转换器的第二操作模式期间刷新自举电容器。